Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 939-703-0 | CAS number: 1474044-75-1
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Two studies with green algae were conducted. The key study is an OECD 201 guideline compliant study conducted with Desmodesmus subspicatus over 72 hours. Test concentrations of 1.00, 3.20, 10.0, 32.0 and 100 mg/L were investigated for effects on growth rate and yield inhibition under static conditions. The test concentration were analytical verified and in the range of 80% to 120% of nominal. After 72 hours the EC50 values for inhibition of growth rate and yield were 29 and 16.7 mg/L, respectively. The EC10 values for inhibition of growth rate and yield were 16.5 and 11.7 mg/L, respectively. All validity criteria were met.
In a non-GLP supporting study over 5 days with the green algae Desmodesmus subspicatus, formerly know as Scenedesmus subspicatus, nominal test concentrations of 10, 18, 32, 58, 100 mg/L were investigated. After 5 days the EC50 for growth rate was graphically determined to be 47 mg/L.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 29 mg/L
- EC10 or NOEC for freshwater algae:
- 16.5 mg/L
Additional information
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
